Modern Tire Dealer

APR 2019

Magazine for the professional tire industry

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M T D A p r i l 2 0 1 9 74 T P M S SUBJECT VEHICLES: 2010 – 2018 Ford Econoline (E150-E450). RELEARN PROCEDURE? No. SPECIAL TOOLS NEEDED? Yes, TPMS activation tool (204-363). T he tire pressure monitoring sys- tem (TPMS) monitors the air pressure in the 4 road tires with wheel-mounted tire pressure sen- sors. e sensors transmit radio frequency signals to the smart junction box (SJB) approximately every 60 seconds when the vehicle speed exceeds 20 mph (32 km/h). If the vehicle is stationary for more than 30 minutes, the sensor will enter into a "sleep mode" and stop transmitting. Each tire pressure sensor transmis- sion is compared against a low-pressure limit (the pressure listed on the vehicle certification label minus 25%, which will be about 6-9 psi). If it is determined that the tire pressure has fallen below this limit, the SJB sends a message to the instrument cluster, which then illuminates the low pressure warning indicator and displays the appropriate message(s) in the message center (if equipped). is vehicle may be equipped with one of two different kinds of sensors: a strap and cradle sensor or a valve-mounted sensor. In either case, the sensor cannot be seen unless the tire is removed. e valve stem's appearance can be used to determine the type of sensor that is used in the wheel. e following 2 types of valve stems are used on wheels that are equipped with strap and cradle mounted sensors. 1) e valve has a rubber seal between the valve and the wheel with brass of a uniform diameter all the way down to the seal. 2) e valve is all metal and is attached to the wheel by a nut. Valve stems that are equipped with valve-mounted sensors have a rubber seal against the wheel, and an extra brass shoulder, larger in diameter and with no threads, that can only be seen when the valve cap is removed. All tire pressure sensors are battery- operated. e strap and cradle sensors are mounted to metal brackets (called cradles) on the wheels inside the tires. e sensors are mounted 180 degrees from valve stem. e tire pressure sensor may be serviced separately, but the cradle and strap must be replaced together. e valve-mounted sensors are attached to the portion of the valve stem located inside the wheel with a T10 Torx screw. Under the following conditions, the TPMS may not function properly: • Low tire pressure. • Tire pressure sensor is missing or damaged. • Spare tire is installed as a road wheel. • Incorrect tire pressure sensor is installed. • e tire pressure sensor is installed incorrectly. • Non-OEM wheels are installed (aer- market rims). • Non-OEM equipped run-flat tires are installed. • Other non-OEM modifications (roll cages, service barriers, part racks, ladder racks, etc.). TIRE PRESSURE MONITOR WARNING INDICATORS NOTE: As ambient temperature decreases by 6 degrees Celsius (10 degrees Fahrenheit), tire pressure decreases 1 psi (7 kPa). Because tire pressures fluctuate with temperature changes, tire pressures must be set when tires are at outdoor ambient temperatures. Tire pressure may drop enough to be detected by the TPMS, which will activate the low pressure warning light. When the tire pressure warning light comes on solid and message center dis- plays "LOW TIRE PRESSURE," check the air pressure of all tires and adjust to the specified cold pressure listed on the vehicle certification label (found on the driver's door or door pillar). Drive the vehicle at 20 mph (32 km/h) for at least 2 minutes. If the vehicle has been stationary for more than 30 minutes, the sensor will enter into a "sleep mode" and stop transmitting. Make sure the warning light goes off. If the warning light stays on, there is a malfunction in the TPMS. See the appropriate manufacturer service information. When the tire pressure warn- ing light flashes for 70 seconds and then remains illuminated, aer bulb-check has been performed and the message center displays warning messages, there is a mal- function in the TPMS. See the appropriate manufacturer service information. TPMS RESET PROCEDURES NOTE: If the tire pressure sensor is replaced, it will need to be trained. If the vehicle has different front and rear tire pressures, the tire pressure has to be adjusted and the TPMS sensors has to be trained. If the vehicle has the same tire pressure on the front and rear tires, the TPMS is not affected by wheel and tire rotation. When the tire pressure warning light comes on solid and the message center displays "LOW TIRE PRESSURE," check Ford Econoline (E150-E450): 2010-18 T P M S COURTESY OF FORD MOTOR CO.

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